EP2402093B1 - Dispositif de criblage et procédé de criblage - Google Patents

Dispositif de criblage et procédé de criblage Download PDF

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Publication number
EP2402093B1
EP2402093B1 EP10167888.6A EP10167888A EP2402093B1 EP 2402093 B1 EP2402093 B1 EP 2402093B1 EP 10167888 A EP10167888 A EP 10167888A EP 2402093 B1 EP2402093 B1 EP 2402093B1
Authority
EP
European Patent Office
Prior art keywords
compartment
screening device
particulate material
particulates
perforated wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP10167888.6A
Other languages
German (de)
English (en)
Other versions
EP2402093A1 (fr
Inventor
Anders Kenneth Sorhuus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Technology GmbH
Original Assignee
Alstom Technology AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to EP10167888.6A priority Critical patent/EP2402093B1/fr
Application filed by Alstom Technology AG filed Critical Alstom Technology AG
Priority to CN201180032604.9A priority patent/CN102958620B/zh
Priority to BR112012033477A priority patent/BR112012033477A2/pt
Priority to RU2013103701/03A priority patent/RU2013103701A/ru
Priority to CA2802949A priority patent/CA2802949C/fr
Priority to MX2012014471A priority patent/MX2012014471A/es
Priority to PCT/IB2011/001512 priority patent/WO2012001491A1/fr
Priority to US13/807,763 priority patent/US9033155B2/en
Priority to AU2011273061A priority patent/AU2011273061B2/en
Publication of EP2402093A1 publication Critical patent/EP2402093A1/fr
Priority to ZA2012/09183A priority patent/ZA201209183B/en
Application granted granted Critical
Publication of EP2402093B1 publication Critical patent/EP2402093B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B4/00—Separating by pneumatic tables or by pneumatic jigs
    • B03B4/06—Separating by pneumatic tables or by pneumatic jigs using fixed and inclined tables ; using stationary pneumatic tables, e.g. fluidised beds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/04—Stationary flat screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/08—Separating solids from solids by subjecting their mixture to gas currents while the mixtures are supported by sieves, screens, or like mechanical elements

Definitions

  • the present invention relates to a screening device comprising a first compartment for receiving a solid particulate material to be screened, and a second compartment for receiving screened particulates from said first compartment.
  • the present invention further relates to a method of separating solid particulate material into at least two particulate size-dependent fractions.
  • Screening of solid particulate materials to form separate fractions of differently sized particulates is undertaken for many purposes.
  • One such purpose is to separate desired from undesired particulates from a solid particulate material containing each if such may be accomplished based on a size differential between the desired and the undesired particulates.
  • An example of such is the removal of aluminium oxide powder, also called alumina powder, from a solid particulate material so the desired powder may be fed to, for example, an aluminium production electrolytic cell utilized in the production of aluminium as disclosed in US 2009/0159434 .
  • Screening of solid particulate material is typically done by passing the particulate material through a perforated screening plate.
  • JP-8299909 discloses a fluidized bed chamber having a vertical plate, which operates as a screening plate to separate particles into a fine particle fraction and a coarse particle fraction. Particles of both sizes are introduced into the fluidized bed chamber and pass through the screening plate into a take off chamber having separate take off ports for each fine particles and coarse particles.
  • the screening device disclosed in JP-8299909 is considered inefficient and may provide inaccurate screening.
  • SU 1 280 035 discloses an air sifter for vertical sifting. A flow of air passes vertically upwards through a material and carries lighter particles upwards, and forces those lighter particles vertically upwards through a perforated roof.
  • US 2006/0163118 discloses air sifters for separation of particulates according to the preambles of claims 1 and a method according to the preamble of claim 7.
  • the sifter comprises a hollow body, a foraminous part and a sieve.
  • the sieve and the foraminous part define a particulate input cavity.
  • a gas flow forces fine particles through the sieve, causing a separation of coarse and fine particles.
  • the coarse particles are removed from the input cavity and the fine particles are removed from the output chamber.
  • JP 2000 065327 relates to temperature control in a combustion chamber and uses three drying/thermal beds: a decomposition bed for gradually burning an article at a low fluidization speed, a combustion bed performing a complete combustion at a high fluidization speed, and a heat recovery bed.
  • a grid screen is arranged between the combustion bed and the heat recovery bed.
  • a screening device comprises a perforated wall for separating first compartment and second compartment from each other and for screening the solid particulate material into at least two particulate size-dependent fractions, and a gas permeable layer for fluidization of particulates to simultaneously transport particulates through said screening device along said perforated wall and screen particulates within said screening device.
  • a screening device comprising a first compartment for receiving a solid particulate material to be screened, a second compartment fluidly connected to the first compartment for receiving screened particles from the first compartment, a perforated wall positioned lengthwise between the first compartment and the second compartment to at least partially separate first and second compartments from each other and to screen solid particulate material into at least two different size fractions, perforations of a predetermined size extending through the thickness of the perforated wall and configured so that particles of a size larger than that of the perforations are prevented from passing through the perforations of the perforated wall, and a gas permeable layer for fluidization of particulates within the subject screening device.
  • the first compartment may be provided with a particulate material inlet located in a first end of the screening device.
  • a particulate material outlet is located in a second end of the screening device.
  • the perforated wall positioned adjacent to the particulate material inlet and the particulate material outlet extends lengthwise between the first end and the second end of the screening device to at least partially separate the first compartment from that of the second compartment.
  • a solid particulate material is conveyed into the screening device through the particulate material inlet.
  • Particulate material entering the screening device through particulate material inlet thus enters the interior of the first compartment of said screening device.
  • Particulate material in the interior of the first compartment is transported through the perforations in the perforated wall and into the interior of the second compartment.
  • those particulates of particulate material too large to pass through perforations in the perforated wall are transported out of the interior of the first compartment through an outlet port. Smaller particulates in the second compartment interior are transported out of the second compartment via the particulate material outlet. Accordingly, particulate material screening and transport are accomplished simultaneously.
  • a very space-efficient screening device is provided.
  • a further advantage of the present screening device is that the particulates are subjected to limited, or no, grinding, since the screening process occurs with the particulates in a fluidized state. Hence, the individual particulates will stay substantially unaffected during the screening process, and formation of fines dust will be limited.
  • the solid particulate material in the interior of the first and second compartments, may become fluidized thus behaving in a manner similar to that of a fluid.
  • Gas flow through the gas permeable layer thus enables so-called fluidization of particulate material introduced into the subject screening device. Fluidization of the particulate material ensures effective screening and transport of the particulate material through the screening device.
  • the perforated wall prevents larger sized particles and/or items from entering the interior of the second compartment. Accordingly, a fine particle fraction separated from the particulate material through screening may be discharged or collected from the interior of the second compartment.
  • the first compartment is provided with a particulate material inlet located adjacent to a first end of the screening device and a particulate material outlet located adjacent to a second end of the screening device, the perforated wall extending from the first end to the second end of the screening device, thereby enabling simultaneous transport of at least a portion of said solid particulate material and screening of said solid particulate material.
  • the longest length to widest width ratio of the first compartment is preferably at least 3:1.
  • An advantage of such an embodiment with a longest length to widest width ratio of at least 3:1 makes the screening and transporting of particulate material very efficient, since almost all particulates having a size which is smaller than the size of the perforations in the perforated wall quickly pass through the perforated wall's perforations and into the interior of the second compartment, instead of remaining in the first compartment together with the larger sized particulates.
  • the gas permeable layer or base of the first compartment slopes downward away from the particulate material inlet thus improving the transport of particulate material from the first end to the second end of the screening device.
  • the entire screening device may be manufactured to slightly slope downward, away from the first end of the screening device, with respect to a horizontal plane.
  • the second compartment is also provided with a gas permeable layer for fluidization of particles accommodated therein. Transport of the screened smaller sized particulates along the longitudinal direction of the screening device in a very efficient manner is thereby enabled.
  • the particulates entering the second compartment are thus not only separated from larger particles of the solid particulate material introduced in the first compartment but also transported in a longitudinal direction from the first end toward the second end of the screening device.
  • a gas chamber is arranged below the gas permeable layer. Fluidizing gas flows from the gas chamber through the gas permeable layer to the first and second compartments.
  • the gas chamber comprises a first sub-chamber supplying fluidization gas to the first compartment, and a second sub-chamber being separated from the first sub-chamber and supplying fluidization gas to the second compartment.
  • each of the perforations through the perforated wall is of a uniform size.
  • the method comprises introducing said solid particulate material into a first compartment of a screening device supplied with a pressurized gas via a gas permeable layer for fluidization of at least a portion of the solid particulate material accommodated in the first compartment, and simultaneously screening at least a portion of the solid particulate material through a perforated wall extending from a first end to a second end of the screening device to separate said first compartment from a second compartment of said screening device for separation of larger sized particulates remaining in the first compartment from screened smaller sized particulates accommodated in the second compartment and transporting the larger sized particulates and smaller sized particulates toward the second end of the screening device.
  • An advantage of this method is that the screening occurs simultaneously with the transporting of the particulate material in a fluidized state along/through the perforated wall which results in a very efficient screening process requiring little energy input.
  • the energy consumed is mainly in the supply of pressurized gas through the gas permeable layer used to transport and screen the particulate material.
  • the level of particulate material in first compartment is preferably greater than that in second compartment in at least one vertical cross section of the screening device, thereby generating a material flow of particulates from first compartment to second compartment. Having a greater level of particulate material in the first compartment than the second compartment improves the flow of smaller sized particles from the first compartment to the second compartment.
  • the method further comprises the step of supplying pressurized gas to said second compartment of the screening device through said gas permeable layer for fluidization of at least a portion of the screened smaller sized particulates accommodated in the second compartment.
  • the method further comprises fluidizing the material accommodated in the first compartment independently of the material accommodated in the second compartment.
  • solid particulate material refers to various known compositions of solid particulate materials, such as aluminium oxide powder, the latter having a typical particle size in the range of 10-150 ⁇ m.
  • Figs. 1a and 1b illustrate a screening device 1 according to a first embodiment.
  • the screening device 1 comprises an exterior body 1a defined by a top 1b, which has been removed in Fig. 1a , but which is shown in Fig. 1b , opposed first and second sides 1 c and 1 d attached perpendicularly to top 1b, opposed walls 1e and 1f attached perpendicularly to top 1b and attached to sides 1 c and 1 d, and a base 1 g attached to both sides 1 c and 1 d opposite top 1 b and attached to both walls 1 e and 1f opposite top 1 b.
  • first compartment 3 for receiving solid particulate material to be screened
  • second compartment 5 for receiving screened material from the first compartment 3
  • perforated wall 7 separating the first and second compartments, 3 and 5 respectively, from each other.
  • the first compartment 3 is provided with a particulate material inlet 9, in the form of an inlet channel 9a, through which solid particulate material to be screened may be introduced into the screening device 1, and a particulate material outlet 11, in the form of an aperture 11a covered by a removable cover plate 13, through which larger sized particulate material may be periodically removed from first compartment 3 of interior 1 h of screening device 1.
  • Inlet channel 9a located in side 1c of screening device 1, may, e.g., be connected to a material conveyor suitable to continuously supply solid particulate material to first compartment 3 of screening device 1.
  • the second compartment 5 is provided with a screened particulate material outlet 17, in the form of an outlet channel 17a, through which screened smaller sized particulates exit screening device 1.
  • the outlet channel 17a located in side 1d of screening device 1, may be connected to a material conveyor suitable to continuously remove screened material from screening device 1 and feed the same to, for example, an aluminium production electrolytic cell.
  • Screening device 1 further comprises within interior 1 h a gas permeable layer 21 and a gas chamber 23, as best illustrated in Fig. 1 b.
  • the gas chamber 23 is arranged in the bottom portion 23a of screening device 1 and is separated from each of the first and the second compartments, 3 and 5 respectively, by the gas permeable layer 21.
  • the gas permeable layer 21, which may be made of a gas-permeable fabric, forms a base 21 a of first compartment 3 and a base 21 b of second compartment 5.
  • the gas chamber 23 is fluidly connected to a gas inlet 25 through which pressurized gas, such as pressurized air or nitrogen gas, is supplied from a source of pressurized gas (not shown).
  • the gas chamber 23 is thus capable of supplying pressurized gas to each of the compartments 3 and 5 through gas permeable bases 21 a and 21 b, respectively.
  • the pressurized gas in the gas chamber 23 applies a force on the gas permeable layer 21, which force presses the gas permeable layer 21 against the lower edge of the perforated wall 7.
  • the gas permeable layer 21 abuts the perforated wall 7 in a sealing manner without the need of additional means for fastening the gas permeable layer 21 to the perforated wall 7.
  • the second compartment 5 is fluidly connected to a venting duct 6 through which gas may be discharged from the interior of the second compartment 5.
  • the venting duct 6 is provided with a filter 8 for filtering gas that exit the second compartment 5 through the venting duct 6.
  • the screening device 1 has two elongated walls 1e and 1f connected to the two sides 1c and 1d.
  • Each of the two elongated walls 1e and 1f has lengths L, which are longer than the lengths W of either of the two sides 1 c and 1d.
  • the screening device 1 has an elongated shape, with a width, corresponding to the lengths W of the sides 1 c and 1 d, which is less than its length, corresponding to the lengths L of the walls 1e and 1f.
  • Solid particulate material is fed to the screening device 1 via the inlet channel 9a and is transported through the screening device 1 from a first end 22 thereof, said first end 22 being located adjacent to the first side 1 c, to a second end 24 thereof, said second end 24 being located adjacent to the second side 1d.
  • the first compartment 3 has a compartment length LC that is almost the same as the length L of the elongated walls 1e and 1f, and a widest compartment width WC, adjacent to the first end 22 of the screening device 1, which is almost the same as the widths W of sides 1 c and 1 d.
  • the compartment length LC is the distance from the closest edge 9b of inlet 9 to the closest edge 11b of aperture 11a.
  • the material that cannot pass through perforated wall 7 will travel the distance LC from inlet 9 to aperture 11a along perforated wall 7.
  • the ratio of the compartment length LC to the widest compartment width WC of the first compartment 3 is at least 3:1.
  • the length LC of the first compartment 3 is preferably at least 3 times that of the widest compartment width WC of first compartment 3.
  • Perforated wall 7 extends from the first end 22 to the second end 24 of the elongated screening device 1.
  • the size of the perforations 7a, illustrated in Fig. 1b , through the thickness T of perforated wall 7 is adapted to prevent particulates larger than a predetermined size from passing through into second compartment 5. Particulates of a size smaller than the size of the perforations 7a are able to pass through perforations 7a in perforated wall 7 and enter second compartment 5.
  • the size of perforations 7a is chosen based on the composition of the solid particulate material to be screened and may thus be optimized to achieve a certain purpose.
  • perforated wall 7 is formed by a 3 mm thick steel plate and each of the perforations are circular in shape having a diameter of 8 mm. Perforations 7a are uniformly distributed over the surface 7b of perforated wall 7.
  • perforated wall 7 is substantially vertical so as to contact top 1b perpendicularly, as best shown in Fig. 1b .
  • perforated wall 7 may be angled toward a horizontal plane and thereby contact top 1b at an angle.
  • Perforated wall 7 may be arranged at an angle with regard to the longitudinal axis of screening device 1, as illustrated in Fig. 1a .
  • a cross sectional area taken perpendicular to the longitudinal axis of screening device 1 adjacent to the first end 22, would have a larger first compartment 3 than the same taken adjacent to the second end 24.
  • the cross sectional area of the first compartment 3 decreases in its downstream direction, i.e., in a direction moving from first end 22 toward second end 24 of screening device 1, as best illustrated in Fig. 1a .
  • the cross sectional area of the second compartment 5 gradually increases in its downstream direction, i.e., in a direction moving from first end 22 toward second end 24 of screening device 1.
  • the gas permeable layer 21 is in this embodiment horizontal. Alternatively, it may be slightly sloping with respect to a horizontal plane in order to further improve the transport of material from the first end 22 to the second end 24 of the screening device 1. As an alternative to, or in combination with, a sloping gas permeable layer the screening device itself may be slightly sloping with respect to a horizontal plane. In each such case, the slope should be arranged such that the particulate material experiences a downhill slope when being transported from the first end 22 to the second end 24.
  • first compartment 3 By supplying pressurized gas to gas chamber 23 and allowing this gas to pass upwardly through gas permeable layer 21 and into first compartment 3, the solid particulate material in first compartment 3 becomes fluidized, and creates a so-called "fluidized bed" wherein particulates therein behave as a fluid, as best illustrated in Fig. 1b .
  • Gas permeable layer 21 is configured to achieve fluidization of particles accommodated inside first compartment 3 and second compartment 5.
  • gas chamber 23 and gas permeable layer 21 extends above and over the entire area of base 1g in interior 1h of screening device 1 in order to enable fluidization of particles in both first and second compartments 3 and 5, respectively.
  • Pressurized gas introduced into gas chamber 23 via gas inlet 25 is distributed to both first compartment 3 and second compartment 5 via gas permeable layer 21.
  • the amount of material in first compartment 3 is greater than the amount of material in second compartment 5, as illustrated in Fig 1b . Due to gravity, the greater amount of material in first compartment 3 contributes to a material flow of smaller sized particulates through perforated wall 7 in a direction toward second compartment 5. Consequently, smaller sized particulates of a size smaller than the size of the perforations 7a in perforated wall 7, flow from first compartment 3 to second compartment 5. Larger sized particulates of a size larger than the size of the perforations 7a in perforated wall 7, are retained in first compartment 3, and eventually transported toward aperture 11, adjacent to second end 24 of screening device 1. Occasionally, cover plate 13 is removed from aperture 11, for removal of larger sized particulates from first compartment 3.
  • first compartment 3 As long as solid particulate material is continuously introduced into first compartment 3 at first end 22 of screening device 1, fluidized particulates are transported through screening device 1 toward second end 24. This fluidization of particulates efficiently enables the particulates to be transported in a longitudinal direction within screening device 1 with simultaneous screening thereof. Particulates are transported toward second end 24 of screening device 1 at least as long as there is material flow into first compartment 3. Likewise, the fluidization of particulates in first compartment 3 results in an efficient mixing of the particulates aiding in the flow of smaller sized particulates through perforated wall 7 and into second compartment 5. Fluidization of particulates in first compartment 3 also aids in the separation of larger sized particulates from smaller sized particulates. The smaller sized particulates exit second compartment 5 via outlet channel 17a and may be transported to a storage facility or directly to a production facility, such as an aluminium production electrolytic cell (not shown).
  • the first compartment 3 is provided with a particulate material inlet 9 located adjacent to a first end 22 of the screening device 1, and a particulate material outlet 11 located adjacent to a second end 24 of the screening device 1, the perforated wall 7 extending from the first end 22 to the second end 24 of the screening device 1, thereby enabling simultaneous transport of at least a portion of said solid particulate material and screening of said solid particulate material.
  • Fig. 2 illustrates a none claimed screening device 101.
  • Many features disclosed in first embodiment screening device 1 are also present in Fig 2 .
  • first compartment 103 is provided with gas permeable layer 121, such that only the solid particulate material in first compartment 103 can be fluidized. It is thus not possible to fluidize the smaller sized particulates accommodated within second compartment 105.
  • screening device 101 differs from screening device 1 in that outlet 117 of second compartment 105 extends along the length of second compartment 105, i.e., it extends from first end to second end of screening device 101 and projects downwardly and outwardly through base 101 g.
  • Outlet 117 which connects to base 105a of second compartment 105, preferably connects to base 105a in a horizontal plane below that of gas permeable layer 121 which forms the base 103a of first compartment 103.
  • Base 105a of second compartment 105 preferably angles inwardly from perforated wall 107 and elongated wall 1 01f and downwardly toward connection with outlet 117. This downwardly sloping angle of base 105a serves to guide smaller sized particulates within second compartment 105 toward outlet 117 and exit therethrough.
  • Outlet 117 is covered by a removable plate 118 which can be removed in order to allow screened material to be occasionally discharged from screening device 101.
  • screened material entering second compartment 105 may drop directly down into a silo or onto a conveying device arranged below second compartment 105.
  • second compartment 105 may have multiple outlets 117 along the length of base 105a of screening device 101.
  • Fig. 3 illustrates a screening device 201 according to an embodiment. Many features disclosed in the first embodiment are also present in the this embodiment with similar reference numerals identifying similar or same features. Having mentioned this, the description below will focus on explaining the features of the third embodiment that differ from those of the first embodiment.
  • the screening device 201 differs from the screening device 1 in that gas chamber 223 is divided into a first sub-chamber 223a and a second sub-chamber 223b separated from each other by a wall 227. Each one of the sub-chambers 223a and 223b is provided with a gas inlet 225 and 226, respectively, through which pressurized gas may be supplied from separate gas reservoirs (not shown).
  • Each of the sub-chambers, 223a and 223b may thus be fluidly connected to an individual source of pressurized gas, creating an advantage in that the pressure, and hence, the degree of particulate fluidization inside each of compartments 203 and 205 may be optimized with regard to the particulate material accommodated therein.
  • the gas pressure in first sub-chamber 223a may be set to a higher pressure than that of second sub-chamber 223b, to obtain a more vigorous fluidization of the particulates in first compartment 203 than that in second compartment 205.
  • a more vigorous fluidization of the particulates in first compartment 203 than that in second compartment 205 increases the driving force transporting smaller sized particulates from first compartment 203, through perforations 207a in perforated wall 207, and into second compartment 205.
  • Fig. 4 illustrates screening device 301 in top plan view with its top removed so as to illustrate interior 301 h thereof according to another embodiment.
  • Many features disclosed in the first embodiment are also present in this embodiment with similar reference numerals identifying similar or same features. Having mentioned this, the description below will focus on explaining the features of this embodiment differing from those of the first embodiment.
  • the screening device 301 differs from the screening device 1 in that the screening device 301 in addition to a first compartment 303 and a second compartment 305, being separated from each other by means of a first perforated wall 307, comprises a second perforated wall 329 and a third compartment 331.
  • the third compartment 331 is separated from the second compartment 305 by the second perforated wall 329 having perforations that are smaller in size than perforations of first perforated wall 307.
  • second perforated wall 329 is adapted to prevent particulates larger than a predetermined size from passing through perforations of second perforated wall 329 and into third compartment 331.
  • An inlet channel 309a is fluidly attached to inlet 309 through which solid particulate material may be introduced into first compartment 303.
  • Inlet 309 is arranged in a first end 322 of screening device 301.
  • First compartment 303 is also provided with a particulate material outlet 311 fluidly connected to or integrally formed with an outlet channel 311a, arranged in a second end 324 of screening device 301.
  • second compartment 305 is provided with an outlet 317 fluidly connected to or integrally formed with an outlet channel 317a arranged in second end 324 of screening device 301
  • third compartment 331 is provided with an outlet 333 fluidly connected to or integrally formed with an outlet channel 333a arranged in second end 324 of screening device 301.
  • Screening of the solid particulate material introduced into first compartment 303 allows smaller sized particulates to pass through perforations of first perforated wall 307 and enter into second compartment 305.
  • the particulate material thus entering into second compartment 305 via first perforated wall 307 is screened allowing smaller sized particulates to pass through perforations of second perforated wall 329 and enter into third compartment 331.
  • Solid particulate material introduced into first compartment 303 may thus be separated into three fractions of particulates differing in size.
  • first perforated wall 307 have a diameter of 8 mm
  • second perforated wall 329 have a diameter of 4 mm
  • only particulates having a size smaller than 4 mm may exit third compartment 331 via outlet channel 333a.
  • Particulates 4-8 mm in size may exit second compartment 305 via outlet channel 317a, and particulates 8 mm and larger in size exit first compartment 303 via outlet channel 311 a.
  • Both perforated walls 307 and 329 extend longitudinally from first end 322 to second end 324 of screening device 301. Hence, the screening of particulate material introduced into first compartment 303 at first end 322 of screening device 301 commences simultaneously with the transporting of particulate material from first end 322 to second end 324 of screening device 301.
  • any number of additional perforated walls may be added to screening device 301 to enable separation of particulates into a greater number of size-dependent fractions.
  • Fig. 5 illustrates a none claimed screening device 401 in top plan view with its top removed so as to illustrate interior 401h thereof.
  • the screening device 401 is fully integrated into a particulate transport chute 430 which is operative for transporting particulate matter in a substantially horizontal direction from one position to another, for example from an alumina silo to an aluminium production electrolytic cell.
  • the transport chute 430 is provided with a gas permeable layer 421 extending along the transport chute 430 and also along the screening device 401. Pressurized gas is supplied, from below gas permeable layer 421 to fluidize particulate material such that the particulate material will flow substantially horizontally along transport chute 430.
  • the transport of particulate material in transport chute 430 occurs according to the well-known air slide principle of transporting fluidized material.
  • the screening device 401 comprises a perforated wall 407 which extends from a first end 422 to a second end 424 of the screening device 401, with the first end 422 being located upstream of second end 424, as seen in the direction of particulate transport.
  • the perforated wall 407 separates a first compartment 403 from a second compartment 405.
  • the cross section of screening device 401 is the same as that of transport chute 430, making the screening device 401 fully integrated with transport chute 430.
  • Particulate material to be screened enters, via transport chute 430, first compartment 403 at first end 422 of screening device 401.
  • Particulates of a size smaller than the size of perforations of perforated wall 407 are able to pass through perforations in perforated wall 407 and enter second compartment 405, from which such particulate material is transported further, via second end 424 and transport chute 430, to its intended destination, as indicated by arrows in Fig. 5 .
  • Particulates of a size larger than the size of the perforations in perforated wall 407 are retained in first compartment 403, and eventually transported toward aperture 411, adjacent to second end 424 of screening device 401.
  • cover plate 413 is removed from aperture 411, for removal of larger sized particulates from first compartment 403.
  • the simultaneous transport and screening of material is integrated in the transport chute 430 resulting in a compact and efficient design.
  • a solid particulate material is introduced into screening device 1 through inlet channel 9a located at the first end 22.
  • the solid particulate material to be screened may comprise unwanted larger particles and/or items.
  • unwanted larger particles and/or items may comprise stones, large aggregates of particulates, working gloves, tools and/or generally oversized particulates.
  • At least a portion of the solid particulate material introduced into first compartment 3 of screening device 1 is fluidized by gas supplied to first compartment 3 via gas permeable layer 21.
  • fluidized particulate material will be transported downstream, i.e. in a longitudinal direction toward second end 24 of screening device 1.
  • particles accommodated in second compartment 5 i.e. the smaller sized particulates, are fluidized and transported toward second end 24 of screening device 1.
  • the separated smaller sized particulates are then discharged from second compartment 5 via outlet 17. Larger sized particulates may be removed from first compartment 3 via the opening 11 located at second end 24 of screening device 1.
  • screening device 1 comprises a first compartment 3 for receiving solid particulate material, a second compartment 5 for receiving screened particulates from said first compartment 3, a perforated wall 7 separating the first 3 and second 5 compartments from each other for screening the solid particulate material into at least two particulate size-dependent fractions, and a gas permeable layer 21 for fluidization of particulates in said first compartment 3 and said second compartment 5.
  • the first compartment 3 is provided with a solid particulate material inlet 9 located at a first end 22 of screening device 1, and a particulate material outlet 11 located at a second end 24 of screening device 1, with perforated wall 7 extending from first end 22 to second end 24 of screening device 1, enabling simultaneous transport and screening of at least a portion of said solid particulate material.
  • outlet 11 a of first compartment 3 may be provided with one or more additional screening devices to minimize the amount of smaller sized particulates removed together with the larger sized particulates.
  • first compartment 3 is provided with an aperture 11 through which larger sized particulates may be removed manually after removing cover plate 13.
  • an outlet channel may be fluidly connected to outlet 11a for a continuous discharge of larger sized particulates from screening device 1.
  • perforated wall 7 extends from first side 1c to second side 1 d. It will be appreciated that a screening device 1 could also be provided with a perforated wall 7 that extends along only a portion of the distance from first side 1 c to second side 1 d with other means for separating first compartment 3 from second compartment 5, and/or with a perforated wall 7 that is perforated only along a portion of its length. In the latter case, a first end of the screening device is the starting point of perforations through the perforated wall, and a second end of the screening device is the end of the perforations through the perforated wall.
  • screening device 1 may form part of a channel system feeding particulate material to, e.g., a furnace, an electrolytic cell, an oven, etc.
  • screening device 1 may form part of a feeding system for feeding a furnace of a metal production process with screened particulate material.
  • the screening device may be provided with indicator means for indicating the amount of particulate material in first compartment 3 and/or second compartment 5.
  • Gas permeable layer 21 is in the described embodiments formed by a gas permeable fabric.
  • gas-permeable layer 21 may be formed from a metal material, e.g. in the form of a wire mesh or a thin perforated metal plate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)

Claims (9)

  1. Dispositif de criblage comprenant un premier compartiment (3) pour recevoir une matière particulaire solide à cribler, un deuxième compartiment (5) pour recevoir des particules criblées en provenance dudit premier compartiment (3), une paroi perforée (7) agencée sensiblement verticalement pour séparer le premier compartiment (3) et le deuxième compartiment (5) l'un de l'autre et pour cribler la matière particulaire solide en au moins deux fractions particulaires fonction de la taille, le premier compartiment (3) comprenant une couche perméable au gaz (21a) pour la fluidisation de particules afin de simultanément transporter des particules à travers ledit dispositif de criblage le long de ladite paroi perforée (7) et cribler des particules à l'intérieur dudit dispositif de criblage, et ledit deuxième compartiment (5) comprend une couche perméable au gaz (21b) pour la fluidisation de particules dans celui-ci, caractérisé en ce que ladite couche perméable au gaz (21a) du premier compartiment (3) et ladite couche perméable au gaz (21b) du deuxième compartiment (5) sont agencées à la base du compartiment, respectivement.
  2. Dispositif de criblage selon la revendication 1, dans lequel le rapport entre la longueur (LC) et la plus grande largeur (WC) du premier compartiment (3) est d'au moins 3:1.
  3. Dispositif de criblage selon l'une quelconque des revendications précédentes, dans lequel ladite couche perméable au gaz (21) est inclinée vers le bas dans une direction qui s'étend à partir de la première extrémité (22) jusqu'à la deuxième extrémité (24) du dispositif de criblage (1).
  4. Dispositif de criblage selon la revendication 1, dans lequel une chambre à gaz est agencée en dessous de la couche perméable au gaz (21) pour un écoulement de gaz de fluidisation jusqu'à un premier compartiment (203) et à un deuxième compartiment (205), et ladite chambre à gaz comprend une première sous-chambre (223a) pour un écoulement de gaz de fluidisation jusqu'au premier compartiment (203), et une deuxième sous-chambre (223b) qui est séparée de façon fluidique de la première sous-chambre, pour un écoulement de gaz de fluidisation jusqu'au deuxième compartiment (205).
  5. Dispositif de criblage selon l'une quelconque des revendications précédentes, dans lequel chaque perforation (7a) à travers la paroi perforée (7) est de taille uniforme.
  6. Dispositif de criblage selon l'une quelconque des revendications précédentes, dans lequel une paroi perforée supplémentaire (329) sépare le deuxième compartiment (305) d'un troisième compartiment (331), la paroi perforée supplémentaire (329) s'étendant à partir de la première extrémité (322) jusqu'à la deuxième extrémité (324) du dispositif de criblage (301), et présentant des perforations dont la taille est plus petite que celle des perforations de la paroi perforée (307) qui sépare le premier compartiment (303) du deuxième compartiment (305).
  7. Procédé pour séparer une matière particulaire solide en au moins deux fractions particulaires fonction de la taille, ledit procédé comprenant l'étape consistant à:
    introduire un gaz sous pression dans un premier compartiment (3) d'un dispositif de criblage (1) à travers une couche perméable au gaz (21a) pour la fluidisation d'au moins une partie d'une matière particulaire solide dans celui-ci afin de simultanément transporter ladite matière particulaire solide à travers ledit dispositif de criblage (1) le long d'une paroi perforée (7) agencée sensiblement verticalement et cribler au moins une partie de la matière particulaire solide à travers la paroi perforée (7), pour obtenir des particules non criblées séparées de plus grande taille dans le premier compartiment (3) et des particules criblées de plus petite taille dans le deuxième compartiment (5),
    comprenant l'étape consistant à introduire un gaz sous pression dans le deuxième compartiment (5) du dispositif de criblage (1) à travers une couche perméable au gaz (21b) pour la fluidisation d'au moins une partie desdites particules criblées de plus petite taille dans le deuxième compartiment (5),
    caractérisé en ce que le gaz sous pression pour la couche perméable (21a) du premier compartiment (3) et pour la couche perméable (21b) du deuxième compartiment (5) est fourni à travers la base du compartiment respectif.
  8. Procédé selon la revendication 7, dans lequel le niveau de matière particulaire dans le premier compartiment (3) est supérieur à celui dans le deuxième compartiment (5) dans au moins une section transversale verticale dudit dispositif de criblage (1), générant de ce fait un écoulement matériel de particules à partir du premier compartiment (3) jusqu'au deuxième compartiment (5).
  9. Procédé selon l'une quelconque des revendications 7 ou 8, dans lequel la matière particulaire solide dans le premier compartiment (103; 203) est fluidisée indépendamment de la matière particulaire solide dans le deuxième compartiment (105; 205).
EP10167888.6A 2010-06-30 2010-06-30 Dispositif de criblage et procédé de criblage Not-in-force EP2402093B1 (fr)

Priority Applications (10)

Application Number Priority Date Filing Date Title
EP10167888.6A EP2402093B1 (fr) 2010-06-30 2010-06-30 Dispositif de criblage et procédé de criblage
AU2011273061A AU2011273061B2 (en) 2010-06-30 2011-06-28 Screening device and method of screening
RU2013103701/03A RU2013103701A (ru) 2010-06-30 2011-06-28 Просеивающее устройство и способ просеивания
CA2802949A CA2802949C (fr) 2010-06-30 2011-06-28 Dispositif de criblage et procede de criblage
MX2012014471A MX2012014471A (es) 2010-06-30 2011-06-28 Dispositivo y metodo de tamizado.
PCT/IB2011/001512 WO2012001491A1 (fr) 2010-06-30 2011-06-28 Dispositif de criblage et procédé de criblage
CN201180032604.9A CN102958620B (zh) 2010-06-30 2011-06-28 筛分装置和筛分方法
BR112012033477A BR112012033477A2 (pt) 2010-06-30 2011-06-28 dispositivo de triagem e método de triagem
US13/807,763 US9033155B2 (en) 2010-06-30 2011-06-28 Screening device and method of screening
ZA2012/09183A ZA201209183B (en) 2010-06-30 2012-12-05 Screening device and method of screening

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10167888.6A EP2402093B1 (fr) 2010-06-30 2010-06-30 Dispositif de criblage et procédé de criblage

Publications (2)

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EP2402093A1 EP2402093A1 (fr) 2012-01-04
EP2402093B1 true EP2402093B1 (fr) 2015-06-17

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US (1) US9033155B2 (fr)
EP (1) EP2402093B1 (fr)
CN (1) CN102958620B (fr)
AU (1) AU2011273061B2 (fr)
BR (1) BR112012033477A2 (fr)
CA (1) CA2802949C (fr)
MX (1) MX2012014471A (fr)
RU (1) RU2013103701A (fr)
WO (1) WO2012001491A1 (fr)
ZA (1) ZA201209183B (fr)

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CN102989577A (zh) * 2012-11-29 2013-03-27 常州国岱选煤科技有限公司 筛选跳汰一体机
CN103394463B (zh) * 2013-07-20 2015-09-23 温州镇田机械有限公司 蒸汽式快速沸腾固体分离机的中心轴装置
US9849462B2 (en) * 2014-09-16 2017-12-26 Snoby Separation Systems, Llc Sifting apparatuses
US9561510B2 (en) * 2014-09-16 2017-02-07 Snoby Separation Systems, Llc Sifting apparatus
US10078207B2 (en) 2015-03-18 2018-09-18 Endochoice, Inc. Systems and methods for image magnification using relative movement between an image sensor and a lens assembly
RU2608142C2 (ru) * 2015-03-25 2017-01-16 Научно-производственная корпорация "Механобр-техника" (ЗАО) Вибрационный классификатор
TWI695163B (zh) * 2018-12-19 2020-06-01 財團法人工業技術研究院 粒狀物感測裝置

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Also Published As

Publication number Publication date
EP2402093A1 (fr) 2012-01-04
WO2012001491A1 (fr) 2012-01-05
CA2802949C (fr) 2016-10-18
RU2013103701A (ru) 2014-08-10
CA2802949A1 (fr) 2012-01-05
AU2011273061A1 (en) 2013-01-10
ZA201209183B (en) 2014-02-26
MX2012014471A (es) 2013-04-03
AU2011273061B2 (en) 2015-08-20
CN102958620B (zh) 2016-03-30
US20130206649A1 (en) 2013-08-15
BR112012033477A2 (pt) 2019-09-24
US9033155B2 (en) 2015-05-19
CN102958620A (zh) 2013-03-06

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